| Deadliest U.S. Wars | 0 | - | 4.89 | 189,251 |
| US States Quiz | 0 | - | 5.00 | 16,700,071 |
| States of the U.S. in Alphabetical Order | 0 | - | 4.98 | 365,251 |
| Name the U.S. National Parks | 0 | - | 4.86 | 58,929 |
| Total United States Immigration by Country | 0 | - | 4.91 | 110,657 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,146 |
| "Do Not Travel" Countries for U.S. Citizens | 0 | - | 4.97 | 240,898 |
| U.S. Cabinet Departments | 0 | - | 4.86 | 72,526 |
| Top 10 Non-English Languages Spoken in New York City | 0 | - | 4.84 | 65,619 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 327,958 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,196 |
| Pixelated United States Map | 0 | - | 4.89 | 93,473 |
| Most-Visited Countries by Americans | 0 | - | 4.87 | 108,459 |
| Countries that Visit the United States the Most | 0 | - | 4.96 | 90,848 |
| The 13 Colonies Quiz | 0 | - | 4.97 | 116,726 |
| U.S. States with the Letter Y | 0 | - | 4.85 | 110,355 |
| 10 Southernmost U.S. States | 0 | - | 4.88 | 112,408 |
| U.S. States with Short Names | 0 | - | 4.91 | 147,668 |
| U.S. States that Start with M | 0 | - | 4.93 | 185,903 |
| U.S. States By Population | 0 | - | 4.92 | 152,361 |
| U.S. States that Start with N | 0 | - | 4.95 | 170,401 |
| U.S. States with Longest Names | 0 | - | 4.84 | 43,863 |
| U.S. States with a Unique First Letter | 0 | - | 4.96 | 87,549 |
| 10 Westernmost U.S. States | 0 | - | 4.95 | 63,763 |
| The Only Remaining U.S. State . . . | 0 | - | 4.92 | 64,879 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,805 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,416 |
| Countries that Beat the United States | 0 | - | 4.93 | 165,569 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,579 |
| US States with an Empty Map | 0 | - | 5.00 | 618,810 |
| Top 10 Most-Visited U.S. States | 0 | - | 4.90 | 101,090 |
| U.S. States with the Most Immigrants | 0 | - | 4.85 | 81,928 |
| U.S. States or European Countries by Area | 0 | - | 4.94 | 94,711 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 131,934 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 206,699 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 123,862 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,658 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,062 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,550 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,480 |
| States of Mexico | 0 | - | 4.95 | 173,332 |
| Mexico States Map Quiz | 0 | - | 4.84 | 103,786 |
| U.S. State Nicknames Quiz | 0 | - | 4.47 | 50,261 |
| Countries with American Expatriates | 0 | - | 4.53 | 42,475 |
| United States Landmarks Map Quiz | 0 | - | 4.55 | 40,076 |
| United States Country Quiz | 0 | - | 4.43 | 100,579 |
| Busiest Air Routes from the U.S. | 0 | - | 4.46 | 76,600 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,654,143 |
| American Founding Fathers | 0 | - | 4.41 | 23,074 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,134 |
| California Groups of Things | 0 | - | 4.25 | 45,266 |
| Los Angeles vs. New York | 0 | - | 4.41 | 19,640 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,204 |
| Famous People from New York by Picture | 0 | - | 4.03 | 27,350 |
| New York Groups of Things | 0 | - | 4.38 | 59,940 |
| People on Money - United States | 0 | - | 4.31 | 63,205 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,240 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,731 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,354 |
| Asian Countries Americans Travel to the Most | 0 | - | 4.75 | 59,652 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,533 |
| U.S. Geography by Letter - S | 0 | - | 4.54 | 52,076 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 743,192 |
| Countries Closest to the U. S. | 0 | - | 4.41 | 207,857 |
| American Geography Quiz for Dummies | 0 | - | 4.41 | 68,710 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,736 |
| Top 10 Non-English Languages of Los Angeles | 0 | - | 4.42 | 59,589 |
| Who Did that Motown Song? | 0 | - | 4.48 | 13,019 |
| New England States | 0 | - | 4.51 | 59,707 |
| U.S. States by Land Area | 0 | - | 4.61 | 52,473 |
| Top 10 U.S. States by Inland Water Area | 0 | - | 4.53 | 37,883 |
| Add a Letter - Make a U.S. State | 0 | - | 4.72 | 82,314 |
| Top 10 Widest U.S. States East to West | 0 | - | 4.69 | 55,640 |
| Top 10 Tallest U.S. States North to South | 0 | - | 4.74 | 40,664 |
| U.S. States by Borders | 0 | - | 4.63 | 35,069 |
| Save Americans by Guessing U.S. States | 0 | - | 4.61 | 182,539 |
| 10 Easternmost U.S. States | 0 | - | 4.53 | 56,238 |
| The Only U.S. State ... #1 | 0 | - | 4.52 | 101,137 |
| 50 States, 50 Cities - Hard Version | 0 | - | 4.46 | 43,991 |
| Countries that Beat Canada | 0 | - | 4.90 | 86,847 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,507 |
| United States Map Quiz | 0 | - | 4.98 | 4,141,770 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,313 |
| Geography of California | 0 | - | 4.25 | 10,501 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,443 |
| New York Pro Sport Teams | 0 | - | 4.32 | 25,801 |
| History of Pennsylvania | 0 | - | 4.16 | 7,087 |
| History of Virginia | 0 | - | 4.31 | 11,556 |
| Events in U.S. History | 0 | - | 4.40 | 28,479 |
| Georgia ... or Georgia? | 0 | - | 4.69 | 76,418 |
| Flags of North and South America | 0 | - | 4.99 | 367,168 |
| Belize Country Quiz | 0 | - | 4.85 | 20,805 |
| Saint Vincent and the Grenadines Country Quiz | 0 | - | 4.88 | 19,052 |
| Top U.S. Universities | 0 | - | 4.15 | 144,065 |
| Largest United States Airlines | 0 | - | 4.39 | 54,834 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,302 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 39,668 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,342 |
| U.S. States by Governor | 0 | - | 4.43 | 17,984 |
| U.S. Political Parties in History | 0 | - | 4.44 | 27,572 |
| U.S. Government Agencies | 0 | - | 4.44 | 19,545 |
| U.S. Presidents by Picture | 0 | - | 4.87 | 423,715 |
| Famous People from Alabama by Picture | 0 | - | 4.07 | 23,954 |
| Florida Pro Sport Teams | 0 | - | 4.61 | 11,752 |
| Hawaiian Islands | 0 | - | 4.83 | 42,427 |
| Boston Talk to English Translation Quiz | 0 | - | 4.59 | 55,691 |
| Famous People from Michigan by Picture | 0 | - | 4.30 | 21,294 |
| State Quiz - New York | 0 | - | 4.52 | 45,738 |
| Boroughs of New York City | 0 | - | 4.47 | 84,096 |
| Famous People from Texas by Picture | 0 | - | 3.99 | 33,259 |
| Six Flags Over Texas | 0 | - | 4.79 | 63,009 |
| U.S. States that Border Tennessee | 0 | - | 4.83 | 65,088 |
| The Life of Thomas Edison | 0 | - | 4.03 | 4,895 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,662 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,405 |
| U.S. States with the Highest Percentage of Farmland | 0 | - | 4.80 | 65,277 |
| U.S. States with the Lowest Percentage of Farmland | 0 | - | 4.74 | 55,029 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.46 | 51,977 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,415 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,482 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,928 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,692 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,578 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,384 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,271 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,479 |
| Top 10 U.S. States with the Highest Elevation | 0 | - | 4.51 | 67,766 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,425 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,086 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,404 |
| U.S. States with the Lowest Average Elevation | 0 | - | 4.55 | 38,391 |
| U.S. States With the Highest Average Elevation | 0 | - | 4.61 | 32,665 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,562 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,033 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,227 |
| U.S. Geography by Letter - C | 0 | - | 4.26 | 73,344 |
| U.S. Geography by Letter - A | 0 | - | 4.38 | 62,316 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,313 |
| U.S. Geography by Letter - T | 0 | - | 4.27 | 49,002 |
| U.S. Geography by Letter - P | 0 | - | 4.34 | 47,387 |
| U.S. Geography by Letter - M | 0 | - | 4.13 | 52,601 |
| U.S. Geography by Letter - L | 0 | - | 4.03 | 40,360 |
| U.S. Geography by Letter - G | 0 | - | 4.12 | 38,605 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,338 |
| Third Most Common Language by U.S. State | 0 | - | 4.89 | 113,377 |
| American Legal Vocabulary | 0 | - | 4.40 | 33,792 |
| U.S. Cities by Picture #1 | 0 | - | 4.37 | 34,354 |
| Cities by Picture #2 | 0 | - | 4.19 | 34,936 |
| The U.S. Government - How Does it Work? | 0 | - | 4.34 | 42,161 |
| First Names of U.S. Presidents | 0 | - | 4.85 | 379,542 |
| Musical Acts from Los Angeles by Two Songs | 0 | - | 4.27 | 15,835 |
| Movies Set in San Francisco | 0 | - | 4.23 | 19,907 |
| Movies Set in Miami | 0 | - | 4.32 | 16,672 |
| Musical Acts from New York City | 0 | - | 3.82 | 10,101 |
| History of New York | 0 | - | 4.36 | 16,282 |
| Last 10 U.S. States Alphabetically | 0 | - | 4.35 | 74,607 |
| Top 10 Least Populous U.S. State Capitals | 0 | - | 4.52 | 21,463 |
| Flyover States | 0 | - | 4.52 | 29,395 |
| U.S. States With Double Letters | 0 | - | 4.54 | 23,916 |
| U.S. States Bigger than Their Neighbors | 0 | - | 4.27 | 75,811 |
| U.S. States by Wikipedia Descriptions #1 | 0 | - | 4.57 | 39,192 |
| U.S. States by Wikipedia Descriptions #2 | 0 | - | 4.47 | 36,979 |
| 50 States, 50 Cities - Easy Version | 0 | - | 4.39 | 127,992 |
| Top 10 Richest U.S. States by Median Income | 0 | - | 4.47 | 118,557 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,311 |
| Countries of Europe in 1650 with a Map | 0 | - | 4.95 | 67,418 |
| The Only American Country ... | 0 | - | 4.92 | 120,757 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,336 |
| U.S. State Border Crossings | 0 | - | 4.97 | 95,954 |
| U.S. Citizenship Test Questions | 0 | - | 4.83 | 238,322 |
| U.S. Cities with the Most International Tourists | 0 | - | 4.88 | 74,863 |
| Name a Valid U.S. President #1 | 0 | - | 4.89 | 189,843 |
| History of Florida | 0 | - | 4.45 | 9,764 |
| Cities and Towns of Massachusetts | 0 | - | 4.92 | 73,062 |
| History of Texas | 0 | - | 4.43 | 14,554 |
| Countries Larger Than Texas but With Fewer People | 0 | - | 4.92 | 39,491 |
| Regions of U.S. States | 0 | - | 4.37 | 43,467 |
| States, Provinces & Territories that Touch the Appalachian Mountains | 0 | - | 4.59 | 20,341 |
| 10 U.S. States with the Most Valuable Crops | 0 | - | 4.41 | 29,493 |
| U.S. States with the Lowest HDI | 0 | - | 4.46 | 28,763 |
| Which U.S. State - Multiple Choice | 0 | - | 4.48 | 20,195 |
| Movies by State | 0 | - | 4.27 | 40,443 |
| Canada Country Quiz | 0 | - | 4.54 | 131,705 |
| Canada Cities Map Quiz | 0 | - | 4.63 | 123,608 |
| Canada A-Z | 0 | - | 4.73 | 32,647 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 148,942 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,415 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,109 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 105,891 |
| Biggest Mongol Empire Countries | 0 | - | 4.89 | 80,674 |
| Top 10 American Countries by Coastline | 0 | - | 4.96 | 88,072 |
| Top 10 Richest Countries in the Americas | 0 | - | 4.90 | 76,094 |
| Top 10 Biggest Economies in the Americas | 0 | - | 4.94 | 91,084 |
| U.S. Geography by Letter - N | 0 | - | 3.79 | 52,158 |
| U.S. Geography by Letter - E | 0 | - | 3.73 | 48,195 |
| U.S. Geography by Letter - F | 0 | - | 3.86 | 44,447 |
| U.S. Geography by Letter - O | 0 | - | 3.43 | 33,794 |
| U.S. Geography by Letter - R | 0 | - | 4.15 | 30,269 |
| Mexico Country Quiz | 0 | - | 4.49 | 71,974 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 33,314 |
